<!DOCTYPE html><html lang="en"><head><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Transition</title><link rel="stylesheet" type="text/css" href="demo.css"></head><body><div class="container"><div class="header"><ul><li><a><span class="add"></span></a></li><li><a><span class="del"></span></a></li></ul></div></div></body></html>